US20140055148A1 - Identifying Transmission/Reception Coils of a Magnetic Resonance Imaging Scanner with the Aid of Electronically Readable Labels - Google Patents
Identifying Transmission/Reception Coils of a Magnetic Resonance Imaging Scanner with the Aid of Electronically Readable Labels Download PDFInfo
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- US20140055148A1 US20140055148A1 US13/974,573 US201313974573A US2014055148A1 US 20140055148 A1 US20140055148 A1 US 20140055148A1 US 201313974573 A US201313974573 A US 201313974573A US 2014055148 A1 US2014055148 A1 US 2014055148A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/28—Measuring attenuation, gain, phase shift or derived characteristics of electric four pole networks, i.e. two-port networks; Measuring transient response
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3692—Electrical details, e.g. matching or coupling of the coil to the receiver involving signal transmission without using electrically conductive connections, e.g. wireless communication or optical communication of the MR signal or an auxiliary signal other than the MR signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/24—Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/288—Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/341—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/341—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils
- G01R33/3415—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils comprising arrays of sub-coils, i.e. phased-array coils with flexible receiver channels
Definitions
- the present embodiments relate to methods and devices for identifying position of transmission/reception coils of an MRI scanner.
- Magnetic resonance imaging (MRI) scanners for examining objects or patients by magnetic resonance imaging are known from, for example, DE10314215B4.
- the present embodiments may obviate one or more of the drawbacks or limitations in the related art. For example, identification of transmission/reception coils of a magnetic resonance imaging scanner is optimized.
- FIG. 1 shows, in a side view at the top of FIG. 1 and in a top view at the bottom of FIG. 1 , one embodiment of a local coil as a transmission/reception coil on a patient couch during entry into a bore of a magnetic resonance imaging (MRI) scanner;
- MRI magnetic resonance imaging
- FIG. 2 shows one embodiment including a label, a reading unit and a database with local coil identity numbers
- FIG. 3 shows a top view of one embodiment of a local coil provided with six labels on a patient table on which (on a spinal column coil thereof arranged therein) reading unit reading antennas are arranged for reading signals emitted by the labels;
- FIG. 4 shows a top view of one embodiment of a local coil provided with a reading-unit reading antenna on a patient table on which (on a spinal column coil thereof arranged therein) labels are arranged for transmitting signals for the reading-unit reading antennas;
- FIG. 5 shows a top view of one embodiment of a local coil provided with six labels on a patient table and an MRI scanner bore, on which reading-unit reading antennas for reading signals emitted by the labels are arranged;
- FIG. 6 shows one embodiment of an MRI system.
- FIG. 6 shows a magnetic resonance imaging (MRI) scanner 101 (e.g., situated in a shielded room or in a Faraday cage F) with a whole body coil 102 with a space 103 (e.g., tubular), in which a patient couch 104 (e.g., a patient table) with a body of, for example, an examination object 105 (e.g., of a patient; with or without local coil arrangement 106 ) may be driven in the direction of the arrow z in order to generate images (e.g., of the knee K) of the patient 105 by an imaging method.
- MRI magnetic resonance imaging
- a local coil arrangement 106 e.g., connected to an MRI scanner control 117 , 110 via an interface in or on the patient couch 104 ), by which, in a local region (e.g., field of view or FOV) of the MRI scanner, recordings of a portion of the body 105 may be generated in the FOV.
- a local region e.g., field of view or FOV
- Radio frequency (RF) signals received by the local coil arrangement 106 may be evaluated (e.g., converted into images, stored or displayed) by an evaluation apparatus (e.g., including elements 168 , 115 , 117 , 119 , 120 , 121 ) of the MRI scanner 101 that may be connected to the local coil arrangement 106 by, for example, coaxial cables or by radio (e.g., element 167 ).
- an evaluation apparatus e.g., including elements 168 , 115 , 117 , 119 , 120 , 121
- radio e.g., element 167
- a magnetic resonance imaging MRI scanner 101 In order to use a magnetic resonance imaging MRI scanner 101 to examine the body 105 (e.g., an examination object or a patient) using magnetic resonance imaging, different magnetic fields are radiated onto the body 105 .
- the magnetic fields are matched very precisely to one another in terms of temporal and spatial characteristics.
- a strong magnet e.g., a cryo-magnet 107
- a measuring cabin with an opening 103 e.g., tunnel-shaped
- a static strong main magnetic field B 0 that may be, for example, 0.2 tesla to 3 tesla or more.
- a body 105 to be examined, supported by a patient couch 104 is driven into a region of the main magnetic field B o that is approximately homogeneous in the observation region FoV.
- Nuclear spins of atomic nuclei of the body 105 are excited by magnetic radiofrequency excitation pulses B 1 ( x, y, z, t ) that are, for example, radiated in by a radiofrequency antenna that is illustrated in a highly simplified fashion as body coil 108 (e.g., multi-part body coil 108 a , 108 b , 108 c ; and/or, optionally, a local coil arrangement).
- Radiofrequency excitation pulses are generated by, for example, a pulse generation unit 109 that is controlled by a pulse sequence control unit 110 . After amplification by a radiofrequency amplifier 111 , the pulses are routed to the radiofrequency antenna 108 .
- the radiofrequency system shown is merely indicated schematically. In other embodiments, more than one pulse generation unit 109 , more than one radiofrequency amplifier 111 and a plurality of radiofrequency antennas 108 a, b, c are employed in a magnetic resonance imaging scanner 101 .
- the magnetic resonance imaging scanner 101 includes gradient coils 112 x , 112 y , 112 z , by which magnetic gradient fields B G (x, y, z, t) for selective slice excitation and for spatial encoding of the measurement signal are radiated in during a measurement.
- the gradient coils 112 x , 112 y , 112 z are controlled by a gradient coil control unit 114 (and optionally via amplifiers Vx, Vy, Vz) that, like the pulse generation unit 109 , is connected to the pulse sequence control unit 110 .
- RF signals emitted by the excited nuclear spins (of the atomic nuclei in the examination object) are received by the body coil 108 and/or at least one local coil arrangement 106 , amplified by associated radiofrequency preamplifiers 116 and processed further and digitized by a reception unit 117 .
- the recorded measurement data is digitized and stored as complex number values in a k-space matrix.
- An associated MRI image may be reconstructed from the k-space matrix filled with values using a multidimensional Fourier transform.
- the correct signal transmission is regulated by an upstream transmission/reception switch 118 .
- An image processing unit 119 generates an image from the measurement data.
- the image is displayed to a user via an operating console 120 and/or stored in a storage unit 121 .
- a central computer unit 122 controls the individual components of the installation.
- images with a high signal-to-noise ratio may be recorded using local coil arrangements (e.g., coils, local coils).
- the local coil arrangements are antenna systems that are attached in the direct vicinity on (anterior), under (posterior), at, or in the body 105 .
- the excited nuclei induce a voltage in the individual antennas of the local coil.
- the induced voltage is amplified using a low-noise preamplifier (e.g., LNA, preamp) and relayed to the reception electronics.
- LNA low-noise preamplifier
- high field installations e.g., 1.5 T-12 T or more are used.
- a switching matrix e.g., RCCS
- the switching matrix routes the currently active reception channels (e.g., the reception channels that currently lie in the field of view of the magnet) to the available receivers.
- the currently active reception channels e.g., the reception channels that currently lie in the field of view of the magnet
- more coil elements than there are receivers available may be connected since, in the case of a whole body coverage, only the coils that are situated in the FoV (field of view) or in the homogeneity volume of the magnet are to be read out.
- an antenna system that may, for example, include one antenna element or, as an array coil, a plurality of antenna elements (e.g., coil elements) may be referred to as local coil arrangement 106 .
- These individual antenna elements are, for example, embodied as loop antennas (e.g., loops), butterfly coils, flex coils, or saddle coils.
- a local coil arrangement includes coil elements, a preamplifier, further electronics (e.g., sheath current chokes), a housing, supports and may include a cable with plugs, by which the coil elements are connected to the MRI scanner.
- a receiver 168 attached on the installation side, filters and digitizes a signal received from a local coil 106 (e.g., by radio) and transmits the data to a digital signal processing apparatus that may derive an image or a spectrum from the data obtained by a measurement and makes the image or spectrum available to the user for, for example, a subsequent diagnosis by the user and/or for storage purposes.
- a local coil 106 e.g., by radio
- a digital signal processing apparatus may derive an image or a spectrum from the data obtained by a measurement and makes the image or spectrum available to the user for, for example, a subsequent diagnosis by the user and/or for storage purposes.
- a patient 105 is, in the case of an MRI scanner 101 , transported into the measurement region FoV of the MRI scanner 101 (e.g., when lying on a table or patient table 104 ) and transported out again (e.g., in the direction of the arrows in FIG. 1 ).
- local coils 106 e.g., local coil arrays made of several antennas or local coils with only one antenna or local coil arrangement
- the local coils serve for receiving and/or transmitting electromagnetic RF signals out of the body.
- each local coil 106 There are a plurality of different local coil types, and many local coils 106 have individual features. So that the whole MRI measurement system may operate in good order, the number, the type and the individual features of each local coil 106 may be unambiguously identified by the system 101 , 110 .
- each local coil 106 and/or the patient table 104 is provided with one or more electronically wirelessly readable labels 2 a .
- Each label 2 a carries a unique identity number 21 (e.g., an ID number) that has only been allocated once in the label.
- Relevant data 22 - 25 with respect to local coils 106 and/or the patient table 104 or the patient tables 104 are stored in a database 2 d .
- the MRI measuring system 101 , 110 is able to identify precisely the number of local coils 106 , the type of local coils 106 , each individual local coil 106 , and the patient table 104 , on which the local coils 106 are assembled.
- the measurement system matching thereto may also be set.
- system 101 , 110 may identify if incorrect (e.g., not fitting to the currently utilized measurement method or MRI scanner type (field strength, manufacturer), no longer functional, or an inadmissible number of local coils 106 are attached and/or arranged on the patient table 104 .
- Local coils 106 that are not connected to the system or incorrectly connected to the system may therefore not be identified and may, under certain circumstances, lead to undesired states of the system that may even lead to the extent of an impairment of patient safety.
- the patient lies, for example, on the patient table 104 during an MRI recording.
- the local coil 106 e.g., local coil arrangement, local coil array
- the local coil 106 is attached to the patient table 104 at a body site K to be examined and, for example, connected with the patient table 104 to the MRI system 101 , 110 via a cable.
- the patient table 104 with patient 105 and local coil 106 is inserted into the MRI scanner housing 101 or bore 103 and subsequently removed therefrom again.
- local coils e.g., local coil arrangements
- S electronically wirelessly transmitting
- readable e.g., RFID
- an embodiment of a system or a device includes at least one reading unit 2 c with one or more integrated or separated reading antennas 2 b and at least one electronically readable label 2 a .
- Stored in each label 2 a is at least one identity number 21 that is only allocated once (in this label) and is transmitted wirelessly by the reading unit 2 c over a definable distance d by signals (e.g., RFID signals) between the reading antenna 2 b and the label 2 a .
- the at least one identity number 21 may therefore be read.
- the MRI system 101 , 110 , 2 d uses the read identity number 21 of the label 2 a to establishes at least the following data from a database 2 d : coil type 22 , coil serial number 23 , coil features 24 , label position 25 on the coil, patient table type 32 , patient table serial number 33 , patient table features 34 , label position 35 on the patient table 104 .
- the following variants may be provided as embodiments of an identification of local coils 106 by an MRI system 101 .
- one or more electronically readable labels 2 a are attached to the housing of the local coil 106 or integrated into the housing.
- One or more reading units 2 c and/or the associated reading antennas 2 b are attached to or in the vicinity of the patient table 104 or integrated into the patient table 104 . If a local coil 106 is brought into the vicinity of the patient table 104 (e.g., into the adjustable reading region of a reading unit 2 c ), then the identity number 21 of one or more labels 2 a housed on or in the coil housing may be read by the MRI system.
- reading units 2 c and/or reading antennas 2 b are used on a patient table 104 , conclusions may be drawn from the information in relation to which reading antennas 2 b were able to read the label 2 a in relation to which region on or over the patient table 104 the label and hence the coil housing is situated (e.g., position determination). As a result of this, it is also possible to identify if more than one local coil 106 is brought into the vicinity of the patient table 104 .
- Coil-related data e.g., at least coil type 22 , coil serial number 23 , coil features 24 , label position 25 on the local coil
- one or more electronically readable labels 2 a are attached to the patient table 104 or integrated into the patient table 104 .
- One or more reading units 2 c or only the associated reading antennas 2 b are attached to the housing of the local coil 106 (e.g., in FIG. 4 ) or integrated into the housing. If a local coil 106 is brought into the vicinity of the patient table 104 (e.g., into the adjustable reading region of a reading unit 2 c ), then the identity number 21 of one or more labels 2 a housed on or in the patient table 104 may be read by one or more reading units in the local coil 106 .
- the overall system 101 , 110 , 2 d may also identify if more than one local coil 106 is situated in the vicinity of the patient table 104 (e.g., thereon).
- Patient table-related data (e.g., at least patient table type 32 , patient table serial number 33 , patient table features 34 , label position 35 on the patient table) is established from the read identity number 21 with the aid of the database 2 d .
- the patient table data 32 - 25 may also be read by a reading antenna 2 b on the system (e.g., on the bore; also, instead of the local coil). The reading process is independent of the connection between the local coil 106 and the system.
- One or more electronically readable labels 2 a may be attached to or integrated in the patient table 104 and attached to or integrated in the housing of the local coil 106 .
- one or more reading units 2 c with, in each case, one or more reading antennas 2 b are attached both in the vicinity of or in the patient table 104 and also on or in the housing of the local coil 106 .
- known methods e.g., temporally separated operation or combination of different label systems
- the coil housings (e.g., of local coils 106 with labels 2 a and/or reading unit antennas 2 b ) may be identified by the patient table 104 , and the patient table 104 (e.g., with labels 2 a and/or reading unit antennas 2 b ) may be identified by the local coil 106 .
- the identification reliability and the accuracy of the position determination may be increased.
- Patient table-related and/or local coil-related data (e.g., at least patient table type 32 , patient table serial number 33 , patient table features 34 , label position 35 on the patient table, coil type 22 , coil serial number 23 , coil features 24 , and/or label position 25 on the local coil) are established, depending on reference point of the label 2 a , from the read identity number 21 with the aid of the database 2 d.
- one or more electronically readable labels 2 a are attached to the housing of the local coil(s) 106 or integrated into the housing.
- One or more reading units 2 c and/or the associated reading antennas 2 b are attached on or in the vicinity of the MRI scanner housing 101 (e.g., on/in the MRI scanner measurement tube or bore 103 ) or integrated into the MRI scanner housing 101 , 103 .
- the reading system may already identify the local coil 106 in the vicinity of the patient table 104 when the table is still situated outside of the MRI scanner housing (e.g., it may be the case that only rough position determination may be provided).
- the local coil 106 which is situated in the vicinity of the patient table 104 , is only identified when the table enters the MRI scanner housing (e.g., MRI scanner measurement tube; more precise position determination may be provided).
- An advantage may be a small required number of reading units 2 c or reading antennas 2 b .
- a disadvantage may be that the local coils 106 are, in the case of a small reading range, only identified just before the local coil 106 enters the MRI scanner housing. The measurement system may therefore only have a little time to decide whether the insertion is to be aborted or reversed. Local coil-related data are established from the read identity number 21 with the aid of the database 2 d , as described above.
- the measurement system may identify an inexpedient or forbidden number or combination of local coils 106 may likewise have an advantageous effect. If too few (e.g., no) or too many (e.g., three) local coils 106 for the envisaged measurement mode are attached to the patient table 104 , the measurement system may refuse to carry out the measurement and provide the operating staff with appropriate advice.
- the MRI system equipped with one or more of the present embodiments only accepts an envisaged number and combination of local coils 106 and only admissible coil types for the set measurement mode. In any other case, the system will not carry out the measurement and will generate error messages.
- An additional use of this embodiment of the method includes the detection of local coils 106 not plugged onto the MRI system. This identification may also be of assistance for satisfying the “lEG 60601 2nd Edition” standard and may make other test methods obsolete.
Abstract
Description
- This application claims the benefit of DE 10 2012 215 006.4, filed on Aug. 23, 2012, which is hereby incorporated by reference.
- The present embodiments relate to methods and devices for identifying position of transmission/reception coils of an MRI scanner.
- Magnetic resonance imaging (MRI) scanners for examining objects or patients by magnetic resonance imaging are known from, for example, DE10314215B4.
- The scope of the present invention is defined solely by the appended claims and is not affected to any degree by the statements within this summary.
- The present embodiments may obviate one or more of the drawbacks or limitations in the related art. For example, identification of transmission/reception coils of a magnetic resonance imaging scanner is optimized.
-
FIG. 1 shows, in a side view at the top ofFIG. 1 and in a top view at the bottom ofFIG. 1 , one embodiment of a local coil as a transmission/reception coil on a patient couch during entry into a bore of a magnetic resonance imaging (MRI) scanner; -
FIG. 2 shows one embodiment including a label, a reading unit and a database with local coil identity numbers; -
FIG. 3 shows a top view of one embodiment of a local coil provided with six labels on a patient table on which (on a spinal column coil thereof arranged therein) reading unit reading antennas are arranged for reading signals emitted by the labels; -
FIG. 4 shows a top view of one embodiment of a local coil provided with a reading-unit reading antenna on a patient table on which (on a spinal column coil thereof arranged therein) labels are arranged for transmitting signals for the reading-unit reading antennas; -
FIG. 5 shows a top view of one embodiment of a local coil provided with six labels on a patient table and an MRI scanner bore, on which reading-unit reading antennas for reading signals emitted by the labels are arranged; and -
FIG. 6 shows one embodiment of an MRI system. -
FIG. 6 shows a magnetic resonance imaging (MRI) scanner 101 (e.g., situated in a shielded room or in a Faraday cage F) with awhole body coil 102 with a space 103 (e.g., tubular), in which a patient couch 104 (e.g., a patient table) with a body of, for example, an examination object 105 (e.g., of a patient; with or without local coil arrangement 106) may be driven in the direction of the arrow z in order to generate images (e.g., of the knee K) of thepatient 105 by an imaging method. Arranged on the patient is, for example, a local coil arrangement 106 (e.g., connected to anMRI scanner control body 105 may be generated in the FOV. Radio frequency (RF) signals received by thelocal coil arrangement 106 may be evaluated (e.g., converted into images, stored or displayed) by an evaluation apparatus (e.g., includingelements MRI scanner 101 that may be connected to thelocal coil arrangement 106 by, for example, coaxial cables or by radio (e.g., element 167). - In order to use a magnetic resonance
imaging MRI scanner 101 to examine the body 105 (e.g., an examination object or a patient) using magnetic resonance imaging, different magnetic fields are radiated onto thebody 105. The magnetic fields are matched very precisely to one another in terms of temporal and spatial characteristics. A strong magnet (e.g., a cryo-magnet 107) in a measuring cabin with an opening 103 (e.g., tunnel-shaped) generates a static strong main magnetic field B0 that may be, for example, 0.2 tesla to 3 tesla or more. Abody 105 to be examined, supported by apatient couch 104, is driven into a region of the main magnetic field Bo that is approximately homogeneous in the observation region FoV. Nuclear spins of atomic nuclei of thebody 105 are excited by magnetic radiofrequency excitation pulses B1(x, y, z, t) that are, for example, radiated in by a radiofrequency antenna that is illustrated in a highly simplified fashion as body coil 108 (e.g.,multi-part body coil pulse generation unit 109 that is controlled by a pulsesequence control unit 110. After amplification by aradiofrequency amplifier 111, the pulses are routed to the radiofrequency antenna 108. The radiofrequency system shown is merely indicated schematically. In other embodiments, more than onepulse generation unit 109, more than oneradiofrequency amplifier 111 and a plurality ofradiofrequency antennas 108 a, b, c are employed in a magneticresonance imaging scanner 101. - The magnetic
resonance imaging scanner 101 includesgradient coils gradient coils pulse generation unit 109, is connected to the pulsesequence control unit 110. - RF signals emitted by the excited nuclear spins (of the atomic nuclei in the examination object) are received by the body coil 108 and/or at least one
local coil arrangement 106, amplified by associatedradiofrequency preamplifiers 116 and processed further and digitized by areception unit 117. The recorded measurement data is digitized and stored as complex number values in a k-space matrix. An associated MRI image may be reconstructed from the k-space matrix filled with values using a multidimensional Fourier transform. - For a coil that may be operated both in the transmission and in the reception mode such as, for example, the body coil 108 or a
local coil 106, the correct signal transmission is regulated by an upstream transmission/reception switch 118. - An
image processing unit 119 generates an image from the measurement data. The image is displayed to a user via anoperating console 120 and/or stored in astorage unit 121. Acentral computer unit 122 controls the individual components of the installation. - In MR imaging, images with a high signal-to-noise ratio (SNR) may be recorded using local coil arrangements (e.g., coils, local coils). The local coil arrangements are antenna systems that are attached in the direct vicinity on (anterior), under (posterior), at, or in the
body 105. During an MR measurement, the excited nuclei induce a voltage in the individual antennas of the local coil. The induced voltage is amplified using a low-noise preamplifier (e.g., LNA, preamp) and relayed to the reception electronics. In order to improve the signal-to-noise ratio, even in the case of high-resolution images, high field installations (e.g., 1.5 T-12 T or more) are used. If it is possible to connect more individual antennas to an MR reception system than there are receivers available, then, for example, a switching matrix (e.g., RCCS) is installed between reception antennas and receiver. The switching matrix routes the currently active reception channels (e.g., the reception channels that currently lie in the field of view of the magnet) to the available receivers. As a result of this, more coil elements than there are receivers available may be connected since, in the case of a whole body coverage, only the coils that are situated in the FoV (field of view) or in the homogeneity volume of the magnet are to be read out. - By way of example, an antenna system that may, for example, include one antenna element or, as an array coil, a plurality of antenna elements (e.g., coil elements) may be referred to as
local coil arrangement 106. These individual antenna elements are, for example, embodied as loop antennas (e.g., loops), butterfly coils, flex coils, or saddle coils. By way of example, a local coil arrangement includes coil elements, a preamplifier, further electronics (e.g., sheath current chokes), a housing, supports and may include a cable with plugs, by which the coil elements are connected to the MRI scanner. Areceiver 168, attached on the installation side, filters and digitizes a signal received from a local coil 106 (e.g., by radio) and transmits the data to a digital signal processing apparatus that may derive an image or a spectrum from the data obtained by a measurement and makes the image or spectrum available to the user for, for example, a subsequent diagnosis by the user and/or for storage purposes. - In accordance with
FIG. 1 , apatient 105 is, in the case of anMRI scanner 101, transported into the measurement region FoV of the MRI scanner 101 (e.g., when lying on a table or patient table 104) and transported out again (e.g., in the direction of the arrows inFIG. 1 ). In some measurement methods, local coils 106 (e.g., local coil arrays made of several antennas or local coils with only one antenna or local coil arrangement) are attached on the patient table 104 in the vicinity of the body tissue (e.g., of the knee K) to be examined. The local coils serve for receiving and/or transmitting electromagnetic RF signals out of the body. There are a plurality of different local coil types, and manylocal coils 106 have individual features. So that the whole MRI measurement system may operate in good order, the number, the type and the individual features of eachlocal coil 106 may be unambiguously identified by thesystem - In accordance with one embodiment, each
local coil 106 and/or the patient table 104 is provided with one or more electronically wirelesslyreadable labels 2 a. Eachlabel 2 a carries a unique identity number 21 (e.g., an ID number) that has only been allocated once in the label. Relevant data 22-25 with respect tolocal coils 106 and/or the patient table 104 or the patient tables 104 are stored in adatabase 2 d. As a result, theMRI measuring system local coils 106, the type oflocal coils 106, each individuallocal coil 106, and the patient table 104, on which thelocal coils 106 are assembled. The measurement system matching thereto may also be set. Additionally, thesystem local coils 106 are attached and/or arranged on the patient table 104. - Since an identification of the
local coils 106 is to be provided for the MRI measurement system, this was previously solved differently in accordance with known variants. In some MRI systems, alllocal coils 106 are connected to the patient table 104 and therefore to the measurement system using one or more cables and one or more plug-in connections. In addition to the signal lines, which are used to operate the coils, electric signals for identifying thelocal coil 106 may be transmitted on additional lines. Solutions using analog codes (e.g., resistant codes) and digital solutions with a storage medium in the local coil (e.g., EEPROM, flash) are known. A disadvantage of this solution may be that the identification may only take place provided that there is a correct plug-in connection.Local coils 106 that are not connected to the system or incorrectly connected to the system (e.g., user forgets the connection, cables are defective) may therefore not be identified and may, under certain circumstances, lead to undesired states of the system that may even lead to the extent of an impairment of patient safety. - By way of example, in accordance with an embodiment shown in
FIG. 1 , the patient lies, for example, on the patient table 104 during an MRI recording. The local coil 106 (e.g., local coil arrangement, local coil array) is attached to the patient table 104 at a body site K to be examined and, for example, connected with the patient table 104 to theMRI system patient 105 andlocal coil 106 is inserted into theMRI scanner housing 101 or bore 103 and subsequently removed therefrom again. In contrast to otherlocal coil 106 identification systems on a magnetic resonance imaging scanner, local coils (e.g., local coil arrangements) are identified at the patient table 104 in this embodiment with the aid of electronically wirelessly transmitting (e.g., RFID) signals (S) and readable (e.g., RFID) labels 2 a. - In accordance with
FIG. 2 , an embodiment of a system or a device includes at least one reading unit 2 c with one or more integrated or separatedreading antennas 2 b and at least one electronicallyreadable label 2 a. Stored in eachlabel 2 a is at least oneidentity number 21 that is only allocated once (in this label) and is transmitted wirelessly by the reading unit 2 c over a definable distance d by signals (e.g., RFID signals) between the readingantenna 2 b and thelabel 2 a. The at least oneidentity number 21 may therefore be read. Using the readidentity number 21 of thelabel 2 a, theMRI system database 2 d:coil type 22, coilserial number 23, coil features 24,label position 25 on the coil,patient table type 32, patient tableserial number 33, patient table features 34,label position 35 on the patient table 104. - For example, the following variants may be provided as embodiments of an identification of
local coils 106 by anMRI system 101. In accordance withFIG. 3 , one or more electronicallyreadable labels 2 a are attached to the housing of thelocal coil 106 or integrated into the housing. One or more reading units 2 c and/or the associatedreading antennas 2 b are attached to or in the vicinity of the patient table 104 or integrated into the patient table 104. If alocal coil 106 is brought into the vicinity of the patient table 104 (e.g., into the adjustable reading region of a reading unit 2 c), then theidentity number 21 of one ormore labels 2 a housed on or in the coil housing may be read by the MRI system. If several reading units 2 c and/or readingantennas 2 b are used on a patient table 104, conclusions may be drawn from the information in relation to whichreading antennas 2 b were able to read thelabel 2 a in relation to which region on or over the patient table 104 the label and hence the coil housing is situated (e.g., position determination). As a result of this, it is also possible to identify if more than onelocal coil 106 is brought into the vicinity of the patient table 104. Coil-related data (e.g., atleast coil type 22, coilserial number 23, coil features 24,label position 25 on the local coil) is established from the readidentity number 21 with the aid of thedatabase 2 d. - In accordance with
FIG. 4 , one or more electronicallyreadable labels 2 a are attached to the patient table 104 or integrated into the patient table 104. One or more reading units 2 c or only the associatedreading antennas 2 b are attached to the housing of the local coil 106 (e.g., inFIG. 4 ) or integrated into the housing. If alocal coil 106 is brought into the vicinity of the patient table 104 (e.g., into the adjustable reading region of a reading unit 2 c), then theidentity number 21 of one ormore labels 2 a housed on or in the patient table 104 may be read by one or more reading units in thelocal coil 106. Ifseveral labels 2 a are attached distributed on or in the patient table 104, conclusions may be drawn from theidentity numbers 21 of the read labels 2 a in relation to which region on or over the patient table 104 the reading antenna(s) 2 b and hence the coil housing of the local coil connected thereto is/are situated (e.g., position determination). As a result of communication between the coil or the coil arrangement and the MRI system, theoverall system local coil 106 is situated in the vicinity of the patient table 104 (e.g., thereon). Patient table-related data (e.g., at leastpatient table type 32, patient tableserial number 33, patient table features 34,label position 35 on the patient table) is established from the readidentity number 21 with the aid of thedatabase 2 d. The patient table data 32-25 may also be read by areading antenna 2 b on the system (e.g., on the bore; also, instead of the local coil). The reading process is independent of the connection between thelocal coil 106 and the system. - The embodiments above may also be combined. One or more electronically
readable labels 2 a may be attached to or integrated in the patient table 104 and attached to or integrated in the housing of thelocal coil 106. Similarly, one or more reading units 2 c with, in each case, one ormore reading antennas 2 b are attached both in the vicinity of or in the patient table 104 and also on or in the housing of thelocal coil 106. Using known methods (e.g., temporally separated operation or combination of different label systems), a negative influence between the individual reading unit/label systems may be avoided. The coil housings (e.g., oflocal coils 106 withlabels 2 a and/orreading unit antennas 2 b) may be identified by the patient table 104, and the patient table 104 (e.g., withlabels 2 a and/orreading unit antennas 2 b) may be identified by thelocal coil 106. By combining this data, the identification reliability and the accuracy of the position determination may be increased. Patient table-related and/or local coil-related data (e.g., at leastpatient table type 32, patient tableserial number 33, patient table features 34,label position 35 on the patient table,coil type 22, coilserial number 23, coil features 24, and/orlabel position 25 on the local coil) are established, depending on reference point of thelabel 2 a, from the readidentity number 21 with the aid of thedatabase 2 d. - By way of example, in accordance with
FIG. 5 , one or more electronicallyreadable labels 2 a are attached to the housing of the local coil(s) 106 or integrated into the housing. One or more reading units 2 c and/or the associatedreading antennas 2 b are attached on or in the vicinity of the MRI scanner housing 101 (e.g., on/in the MRI scanner measurement tube or bore 103) or integrated into theMRI scanner housing local coil 106 in the vicinity of the patient table 104 when the table is still situated outside of the MRI scanner housing (e.g., it may be the case that only rough position determination may be provided). In the case of a smaller reading range, thelocal coil 106, which is situated in the vicinity of the patient table 104, is only identified when the table enters the MRI scanner housing (e.g., MRI scanner measurement tube; more precise position determination may be provided). An advantage may be a small required number of reading units 2 c or readingantennas 2 b. A disadvantage may be that thelocal coils 106 are, in the case of a small reading range, only identified just before thelocal coil 106 enters the MRI scanner housing. The measurement system may therefore only have a little time to decide whether the insertion is to be aborted or reversed. Local coil-related data are established from the readidentity number 21 with the aid of thedatabase 2 d, as described above. - Compared to known previous identification systems of
local coils 106 at a magnetic resonance imaging scanner, employment of electronicallyreadable labels 2 a may result in the advantage that the identification of one or morelocal coils 106 of the measurement system may take place independently of the correct electrical connection between the local coils and the patient couch and/or the MRI system using cables. The arrangement or mechanical attachment of the local coil(s) on the patient table may suffice for the system to be able to decide whether or not safe operation may be undertaken with this arrangement. As a result of the fact that eachlocal coil 106 is identified with individual features, the system may be optimally set to the selected arrangement. Reading the electronicallyreadable labels 2 a may be brought about over a broad and adjustable distance region between reading unit 2 c or readingantenna 2 b andlabel 2 a. As a result, thelocal coils 106 may also be identified when the housings of thelocal coils 106 do not completely exactly engage into the rails and/or holding points provided therefore. - The fact that the measurement system may identify an inexpedient or forbidden number or combination of
local coils 106 may likewise have an advantageous effect. If too few (e.g., no) or too many (e.g., three)local coils 106 for the envisaged measurement mode are attached to the patient table 104, the measurement system may refuse to carry out the measurement and provide the operating staff with appropriate advice. - Good system and patient safety is achieved by the combination of the system achievements. The MRI system equipped with one or more of the present embodiments only accepts an envisaged number and combination of
local coils 106 and only admissible coil types for the set measurement mode. In any other case, the system will not carry out the measurement and will generate error messages. - An additional use of this embodiment of the method includes the detection of
local coils 106 not plugged onto the MRI system. This identification may also be of assistance for satisfying the “lEG 60601 2nd Edition” standard and may make other test methods obsolete. - It is to be understood that the elements and features recited in the appended claims may be combined in different ways to produce new claims that likewise fall within the scope of the present invention. Thus, whereas the dependent claims appended below depend from only a single independent or dependent claim, it is to be understood that these dependent claims can, alternatively, be made to depend in the alternative from any preceding or following claim, whether independent or dependent, and that such new combinations are to be understood as forming a part of the present specification.
- While the present invention has been described above by reference to various embodiments, it should be understood that many changes and modifications can be made to the described embodiments. It is therefore intended that the foregoing description be regarded as illustrative rather than limiting, and that it be understood that all equivalents and/or combinations of embodiments are intended to be included in this description.
Claims (30)
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DE102012215006.4A DE102012215006A1 (en) | 2012-08-23 | 2012-08-23 | Detection of transmitter / receiver coils of a magnetic resonance tomograph with the aid of electronically readable labels |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140055127A1 (en) * | 2012-08-23 | 2014-02-27 | Stephan Biber | Identifying a Position of Transmission/Reception Coils of a Magnetic Resonance Imaging Scanner with Labels Read in Motion |
CN109157217A (en) * | 2018-07-11 | 2019-01-08 | 芜湖帮许来诺医疗设备科技有限公司 | A kind of malcoils localization method based on passive RFID |
EP3945332A1 (en) * | 2020-07-28 | 2022-02-02 | Koninklijke Philips N.V. | Detection of unconnected mr coils and localization of misplaced coils |
US20220088415A1 (en) * | 2019-04-25 | 2022-03-24 | Elekta Limited | Radiotherapy devices and access authorisation |
Citations (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5939883A (en) * | 1996-07-17 | 1999-08-17 | Fonar Corporation | Magnetic resonance imaging excitation and reception methods and apparatus |
US6023166A (en) * | 1997-11-19 | 2000-02-08 | Fonar Corporation | MRI antenna |
US6446208B1 (en) * | 1998-09-10 | 2002-09-03 | Xerox Corporation | User interface system based on sequentially read electronic tags |
US20030179151A1 (en) * | 2001-01-11 | 2003-09-25 | Fujio Senba | Communication device, installation structure for the communication device, method of manufacturing the communication device, and method of communication with the communication device |
US20050253584A1 (en) * | 2004-05-07 | 2005-11-17 | Swen Campagna | Method and control device for determining the position of a local coil on a patient table of a magnetic resonance scanner |
US7106199B2 (en) * | 2003-07-08 | 2006-09-12 | Samsung Electronics Co., Ltd. | RF-ID system with sensor and method of sending additional signals |
US7230425B2 (en) * | 2003-08-15 | 2007-06-12 | Koninklijke Philips Electronics N.V. | MRI system with wireless identification capability |
US20080238885A1 (en) * | 2007-03-29 | 2008-10-02 | N-Trig Ltd. | System and method for multiple object detection on a digitizer system |
US20090027053A1 (en) * | 2007-07-02 | 2009-01-29 | Guenther Decke | Magnetic resonance examination platform with independently moveable bed and antenna device |
US20090058607A1 (en) * | 2007-08-31 | 2009-03-05 | G-Time Electronic Co., Ltd. | Radio frequency identification (rfid) positioning apparatus and method thereof |
US20090146898A1 (en) * | 2004-04-27 | 2009-06-11 | Sony Corporation | Antenna Module-Use Magnetic Core Member, Antenna Module, and Portable Information Terminal Having the Same |
US20100182005A1 (en) * | 2009-01-20 | 2010-07-22 | Stephan Biber | Magnetic resonance tomography apparatus with a local coil and method to detect the position of the local coil |
US20110181287A1 (en) * | 2008-10-08 | 2011-07-28 | Hitachi Medical Corporation | Magnetic resonance imaging apparatus |
US8063783B2 (en) * | 2005-10-12 | 2011-11-22 | Brother Kogyo Kabushiki Kaisha | Tape processing apparatus, tag label producing apparatus, tag assembly, and tape processing method |
US8115496B2 (en) * | 2008-06-25 | 2012-02-14 | Aisin Aw Co., Ltd. | Insulation coated conductor inspection method and inspection apparatus |
US20130082707A1 (en) * | 2011-10-04 | 2013-04-04 | Stephan Biber | Method for the Control of a Magnetic Resonance System |
US20130271129A1 (en) * | 2012-04-13 | 2013-10-17 | Helmut Kess | Detecting Unplugged Local Coils in a Nuclear Magnetic Resonance Tomograph |
US20130342198A1 (en) * | 2012-06-21 | 2013-12-26 | Markus Vester | Local Coil for a Magnetic Resonance Imaging System and Magnetic Resonance Imaging System |
US9489813B1 (en) * | 2006-09-22 | 2016-11-08 | Michael L. Beigel | System for location in environment and identification tag |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10314215B4 (en) | 2003-03-28 | 2006-11-16 | Siemens Ag | Magnetic resonance antenna and method for detuning their natural resonance frequency |
DE102008040003A1 (en) * | 2008-08-27 | 2009-01-29 | Siemens Aktiengesellschaft | Magnetic resonance device for patient, has signal receiving device arranged at magnetic unit, and positioning device with evaluation device connected with signal receiving device for evaluating data i.e. operating time detecting signal |
-
2012
- 2012-08-23 DE DE102012215006.4A patent/DE102012215006A1/en not_active Withdrawn
-
2013
- 2013-08-23 US US13/974,573 patent/US9903897B2/en not_active Expired - Fee Related
Patent Citations (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5939883A (en) * | 1996-07-17 | 1999-08-17 | Fonar Corporation | Magnetic resonance imaging excitation and reception methods and apparatus |
US6023166A (en) * | 1997-11-19 | 2000-02-08 | Fonar Corporation | MRI antenna |
US6446208B1 (en) * | 1998-09-10 | 2002-09-03 | Xerox Corporation | User interface system based on sequentially read electronic tags |
US20030179151A1 (en) * | 2001-01-11 | 2003-09-25 | Fujio Senba | Communication device, installation structure for the communication device, method of manufacturing the communication device, and method of communication with the communication device |
US7106199B2 (en) * | 2003-07-08 | 2006-09-12 | Samsung Electronics Co., Ltd. | RF-ID system with sensor and method of sending additional signals |
US7230425B2 (en) * | 2003-08-15 | 2007-06-12 | Koninklijke Philips Electronics N.V. | MRI system with wireless identification capability |
US20090146898A1 (en) * | 2004-04-27 | 2009-06-11 | Sony Corporation | Antenna Module-Use Magnetic Core Member, Antenna Module, and Portable Information Terminal Having the Same |
US20050253584A1 (en) * | 2004-05-07 | 2005-11-17 | Swen Campagna | Method and control device for determining the position of a local coil on a patient table of a magnetic resonance scanner |
US8063783B2 (en) * | 2005-10-12 | 2011-11-22 | Brother Kogyo Kabushiki Kaisha | Tape processing apparatus, tag label producing apparatus, tag assembly, and tape processing method |
US9489813B1 (en) * | 2006-09-22 | 2016-11-08 | Michael L. Beigel | System for location in environment and identification tag |
US20080238885A1 (en) * | 2007-03-29 | 2008-10-02 | N-Trig Ltd. | System and method for multiple object detection on a digitizer system |
US20090027053A1 (en) * | 2007-07-02 | 2009-01-29 | Guenther Decke | Magnetic resonance examination platform with independently moveable bed and antenna device |
US20090058607A1 (en) * | 2007-08-31 | 2009-03-05 | G-Time Electronic Co., Ltd. | Radio frequency identification (rfid) positioning apparatus and method thereof |
US8115496B2 (en) * | 2008-06-25 | 2012-02-14 | Aisin Aw Co., Ltd. | Insulation coated conductor inspection method and inspection apparatus |
US20110181287A1 (en) * | 2008-10-08 | 2011-07-28 | Hitachi Medical Corporation | Magnetic resonance imaging apparatus |
US20100182005A1 (en) * | 2009-01-20 | 2010-07-22 | Stephan Biber | Magnetic resonance tomography apparatus with a local coil and method to detect the position of the local coil |
US20130082707A1 (en) * | 2011-10-04 | 2013-04-04 | Stephan Biber | Method for the Control of a Magnetic Resonance System |
US20130271129A1 (en) * | 2012-04-13 | 2013-10-17 | Helmut Kess | Detecting Unplugged Local Coils in a Nuclear Magnetic Resonance Tomograph |
US20130342198A1 (en) * | 2012-06-21 | 2013-12-26 | Markus Vester | Local Coil for a Magnetic Resonance Imaging System and Magnetic Resonance Imaging System |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140055127A1 (en) * | 2012-08-23 | 2014-02-27 | Stephan Biber | Identifying a Position of Transmission/Reception Coils of a Magnetic Resonance Imaging Scanner with Labels Read in Motion |
US9726470B2 (en) * | 2012-08-23 | 2017-08-08 | Siemens Aktiengesellschaft | Identifying a position of transmission/reception coils of a magnetic resonance imaging scanner with labels read in motion |
CN109157217A (en) * | 2018-07-11 | 2019-01-08 | 芜湖帮许来诺医疗设备科技有限公司 | A kind of malcoils localization method based on passive RFID |
US20220088415A1 (en) * | 2019-04-25 | 2022-03-24 | Elekta Limited | Radiotherapy devices and access authorisation |
EP3945332A1 (en) * | 2020-07-28 | 2022-02-02 | Koninklijke Philips N.V. | Detection of unconnected mr coils and localization of misplaced coils |
WO2022022959A1 (en) * | 2020-07-28 | 2022-02-03 | Koninklijke Philips N.V. | Detection of unconnected mr coils and localization of misplaced coils |
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US9903897B2 (en) | 2018-02-27 |
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